{"id":824,"date":"2020-11-21T10:47:38","date_gmt":"2020-11-21T16:47:38","guid":{"rendered":"http:\/\/ninmonkeys.com\/blog\/?p=824"},"modified":"2020-11-21T10:47:38","modified_gmt":"2020-11-21T16:47:38","slug":"using-case-sensitive-regular-expressions-in-powershell-tips","status":"publish","type":"post","link":"https:\/\/ninmonkeys.com\/blog\/2020\/11\/21\/using-case-sensitive-regular-expressions-in-powershell-tips\/","title":{"rendered":"Using Case-Sensitive Regular expressions in PowerShell – Tips"},"content":{"rendered":"\n\n\n

Say you want to find functions that uses parameters named like:
-AsString<\/code>, -AsHashTable<\/code>, <\/strong>or -AsByteStream<\/code><\/strong>

Using Find-Member makes it easy<\/a>.<\/p>\n\n\n\n

\"\"
> Find-Member -Name 'As*'<\/code><\/figcaption><\/figure>\n\n\n\n

That’s close, but I want it to start with a capital letter, to skip matches like:
Assembly<\/code> or Asin<\/code> <\/p>\n\n\n\n

Converting Like to a Regex<\/h2>\n\n\n\n

The -like<\/code> pattern As*<\/code> is the same as the regex ^As<\/code>
To start with a capital letter you could use: ^As[A-Z]<\/code>

<\/p>\n\n\n\n

Disabling Case-Sensitive matches<\/h2>\n\n\n\n

<\/p>\n\n\n\n

Because PowerShell defaults <\/strong>to case-insensitive<\/strong> matches
You need to remove the i<\/code> insensitive<\/strong> flag using the syntax (?-i)<\/code><\/p>\n\n\n\n

Solution<\/h2>\n\n\n\n
\"\"
> Find-Member -Name '(?-i)^As[A-Z]' -RegularExpression<\/code><\/figcaption><\/figure>\n\n\n\n

The final pattern is (?-i)^As[A-Z]<\/code>
Making it case-sensitive <\/strong>narrowed down the matches from 113 to 43<\/strong> !<\/p>\n\n\n\n

See More<\/h2>\n\n\n\n